7,866 research outputs found
AdS space compactification and holographic mapping in the AdS/CFT correspondence
Physical consistency of quantum fields in anti-de Sitter space time requires
that the space must be compactified by the inclusion of a boundary where
appropriate conditions are imposed. An interpretation for the presence of this
boundary is found taking AdS as a limiting case of the space generated by a
large number of coincident branes. The compactification of AdS leads to a
discretization of the spectrum of bulk fields. As a consequence, we find a one
to one mapping between the quantum states of scalar fields in AdS bulk and
boundary. Using this mapping as an approximation for the dual relation between
string dilaton field and scalar QCD glueballs the high energy QCD scaling is
reproduced. We also use this map to estimate the ratio of scalar glueball
masses.Comment: 5 pages, talk presented at "Renormalization Group and Anomalies in
Gravity and Cosmology", Ouro Preto, Brazil, March 200
QCD/String holographic mapping and high energy scattering amplitudes
We find a one to one mapping between low energy string dilaton states in AdS
bulk and high energy glueball states on the corresponding boundary. This
holographic mapping leads to a relation between bulk and boundary scattering
amplitudes. From this relation and the dilaton action we find the appropriate
momentum scaling for high energy QCD amplitudes at fixed angles.Comment: Minor changes in text. Version accepted for publication in PL
Does one monetary policy fit all? the determinants of inflation in EMU countries
This chapter aims at assessing the long-run determinants and the short-run dynamics of inflation in each country belonging to the European Monetary Union (EMU). Our work complements the recent literature on this topic for the Euro Area as a whole. Detecting such determinants can be crucial in designing structural reforms acting as aside instruments of monetary policy in maintaining price stability. The empirical methodology consists of a reinterpretation of the structural cointegrating VAR approach, which allows for a structural long-run analysis of inflation determinants along with an accurate assessment of its short-run dynamics. The main conclusion emerging from the estimates is that not only the determinants of inflation differ in the countries belonging to the Euro Area, but also that cost-push factors have a considerable role in explaining inflation in most of the countries examined. As a policy implication, a tight monetary policy pursued in those countries whose inflation is mainly driven by costs would result in a contraction of economic activity without exerting relevant effects on price dynamics.Inflation, markup, EMU countries, long-run structural VARs, subset VEC models
Faddeev-Jackiw formalism for a topological-like oscillator in planar dimensions
The problem of a harmonic oscillator coupling to an electromagnetic potential
plus a topological-like (Chern-Simons) massive term, in two-dimensional space,
is studied in the light of the symplectic formalism proposed by Faddeev and
Jackiw for constrained systems.Comment: 17 pages, Latex file, to appear in Mod. Phys. Let.
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